Paint brush



FIG. 1 is a perspective view of a paint brush showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is an enlarged top plan view thereof; and,

FIG. 5 is an enlarged bottom plan view thereof.

The broken lines in the drawings depict portions of the paint brush thatform no part of the claimed design.

CLAIM The ornamental design for a paint brush, as shown and described.